Long-Term Borrowings (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Less: debt issurance costs	$ (3,290)	$ (3,486)	$ (1,011)
Long-term borrowings	216,710	216,514	68,989
Subordinated Notes, 5.75% [Member]
Subordinated notes	70,000	70,000	$ 70,000
Subordinated Notes, 5.0% [Member]
Subordinated notes	$ 150,000	$ 150,000